How to convert InputStream to FileInputStream

Question

I have this line in my program    InputStream Resource InputStream this getClass   getClassLoader   getResourceAsStream  Resource Name      But how can I get FileInputStream from it  Resource InputStream

User · Answer

You need something like       URL resource   this getClass   getResource   path to resource res        File is   null      try           is   new File resource toURI           catch  URISyntaxException e1               TODO Auto-generated catch block         e1 printStackTrace              try           FileInputStream input   new FileInputStream is         catch  FileNotFoundException e1               TODO Auto-generated catch block         e1 printStackTrace            But it will work only within your IDE  not in runnable JAR  I had same problem explained here

User · Answer

Long story short  Don t use FileInputStream as a parameter or variable type  Use the abstract base class  in this case InputStream instead

User · Answer

Use ClassLoader getResource   instead if its URI represents a valid local disk file system path   URL resource   classLoader getResource  resource ext    File file   new File resource toURI     FileInputStream input   new FileInputStream file            If it doesn t  e g  JAR   then your best bet is to copy it into a temporary file   Path temp   Files createTempFile  resource-     ext    Files copy classLoader getResourceAsStream  resource ext    temp  StandardCopyOption REPLACE EXISTING   FileInputStream input   new FileInputStream temp toFile              That said  I really don t see any benefit of doing so  or it must be required by a poor helper class method which requires FileInputStream instead of InputStream  If you can  just fix the API to ask for an InputStream instead  If it s a 3rd party one  by all means report it as a bug  I d in this specific case also put question marks around the remainder of that API

[java] How to convert InputStream to FileInputStream

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